102129990 has 32 divisors (see below), whose sum is σ = 251739360. Its totient is φ = 26498304.

The previous prime is 102129983. The next prime is 102129991. The reversal of 102129990 is 99921201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102129991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44895 + ... + 47114.

It is an arithmetic number, because the mean of its divisors is an integer number (7866855).

Almost surely, 2^102129990 is an apocalyptic number.

102129990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102129990 is an abundant number, since it is smaller than the sum of its proper divisors (149609370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102129990 is a wasteful number, since it uses less digits than its factorization.

102129990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92056.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 102129990 is about 10105.9383532654. The cubic root of 102129990 is about 467.4312709358.

It can be divided in two parts, 10212 and 9990, that added together give a palindrome (20202).

The spelling of 102129990 in words is "one hundred two million, one hundred twenty-nine thousand, nine hundred ninety".